diff --git a/app/assets/javascripts/discourse/controllers/topic.js.es6 b/app/assets/javascripts/discourse/controllers/topic.js.es6
index 3966e69905a..fe2a3f4fb07 100644
--- a/app/assets/javascripts/discourse/controllers/topic.js.es6
+++ b/app/assets/javascripts/discourse/controllers/topic.js.es6
@@ -540,7 +540,7 @@ export default Ember.Controller.extend(SelectedPostsCount, BufferedContent, {
     },
 
     expandHidden(post) {
-      post.expandHidden();
+      return post.expandHidden();
     },
 
     toggleVisibility() {